#include "sm4.h"
// muint32 rk[32];//作为加解密上下文
const muint8 Sbox[256] = {
    0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
    0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
    0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
    0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
    0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
    0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
    0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
    0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
    0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
    0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
    0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
    0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
    0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
    0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
    0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
    0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48};
const muint32 CK[32] = {
    0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
    0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
    0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
    0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
    0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
    0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
    0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
    0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279};
#define Rotl(_x, _y) (((_x) << (_y)) | ((_x) >> (32 - (_y))))
#define ByteSub(_A) (Sbox[(_A) >> 24 & 0xFF] << 24 ^ \
                     Sbox[(_A) >> 16 & 0xFF] << 16 ^ \
                     Sbox[(_A) >> 8 & 0xFF] << 8 ^   \
                     Sbox[(_A)&0xFF])
#define L1(_B) ((_B) ^ Rotl(_B, 2) ^ Rotl(_B, 10) ^ Rotl(_B, 18) ^ Rotl(_B, 24))
#define L2(_B) ((_B) ^ Rotl(_B, 13) ^ Rotl(_B, 23))
// SM4的加解密函数
// 参数说明：Input为输入信息分组，Output为输出分组，rk为轮密钥
int SM4Crypt(const muint8 *Input, muint8 *Output, const muint32 *rk)
{
    muint32 r, mid, x0, x1, x2, x3, *p;
    p = (muint32 *)Input;
    x0 = p[0];
    x1 = p[1];
    x2 = p[2];
    x3 = p[3];
#ifdef LITTLE_ENDIAN
    x0 = Rotl(x0, 16);
    x0 = ((x0 & 0x00FF00FF) << 8) ^ ((x0 & 0xFF00FF00) >> 8);
    x1 = Rotl(x1, 16);
    x1 = ((x1 & 0x00FF00FF) << 8) ^ ((x1 & 0xFF00FF00) >> 8);
    x2 = Rotl(x2, 16);
    x2 = ((x2 & 0x00FF00FF) << 8) ^ ((x2 & 0xFF00FF00) >> 8);
    x3 = Rotl(x3, 16);
    x3 = ((x3 & 0x00FF00FF) << 8) ^ ((x3 & 0xFF00FF00) >> 8);
#endif
    for (r = 0; r < 32; r += 4)
    {
        mid = x1 ^ x2 ^ x3 ^ rk[r + 0];
        mid = ByteSub(mid);
        x0 ^= L1(mid);
        mid = x2 ^ x3 ^ x0 ^ rk[r + 1];
        mid = ByteSub(mid);
        x1 ^= L1(mid);
        mid = x3 ^ x0 ^ x1 ^ rk[r + 2];
        mid = ByteSub(mid);
        x2 ^= L1(mid);
        mid = x0 ^ x1 ^ x2 ^ rk[r + 3];
        mid = ByteSub(mid);
        x3 ^= L1(mid);
    }
#ifdef LITTLE_ENDIAN
    x0 = Rotl(x0, 16);
    x0 = ((x0 & 0x00FF00FF) << 8) ^ ((x0 & 0xFF00FF00) >> 8);
    x1 = Rotl(x1, 16);
    x1 = ((x1 & 0x00FF00FF) << 8) ^ ((x1 & 0xFF00FF00) >> 8);
    x2 = Rotl(x2, 16);
    x2 = ((x2 & 0x00FF00FF) << 8) ^ ((x2 & 0xFF00FF00) >> 8);
    x3 = Rotl(x3, 16);
    x3 = ((x3 & 0x00FF00FF) << 8) ^ ((x3 & 0xFF00FF00) >> 8);
#endif
    p = (muint32 *)Output;
    p[0] = x3;
    p[1] = x2;
    p[2] = x1;
    p[3] = x0;
    return 1;
}
